The sectorial trajectory of banking in the Province of Malleco (Southern Chile) between 1887 and 1913 is studied, seeking to contribute to regional economic and financial history studies. It is argued that there was a diversification at the beginning of the 20th century, going from focusing on cereal production in the 19th century to expanding its operations in commerce and industry in the 20th, which meant development of the specialized financial sector. An exhaustive review of notarial archives, population and production censuses, ministerial reports, press, and literature was used.